Wood-screw



(No Model.)

I. F. BROWN.

WOOD SGRBW- No. 281,831. Patented July 24, 1883.

Wi'fiesses: jazz/@2721? Was W N. ruins Muu h-r. wmmmu ac.

UNITED STATES PATENT OFFICE.

L ISRAEL F. BROWN, OF NEW LONDON, CONNECTICUT.

WOOD-SCREW.

SPECIFICATION forming part of Letters Patent No. 281,831, dated July 24,1883.

Application filed December 2. 1882. (No model.)

To all whom zit may concern:

Be it known that I, ISRAEL F. BROWN, a citizen of the United States,residing at New London, in the county of New London and State ofConnecticut, have invented certain new and useful Improvements in Wood-Screws, of which the following is a specification, reference being hadtherein to the accompanying drawings.

My invention has relation 'to wood-screws; and its object is to providea screw that will be of such a strength as will readily admit of itsbeing screwed home in the wood without twisting off the head of saidscrew and to that end the novelty consists in the peculiar shape of thehead of the screw, whereby its strength is largely increased, aswill behereinafter more fully set forth.

Figure 1 is an elevation of a countersunk head screw embodying myinvention, and Fig. 2 a similar View of a flator round head screw.

A is the body, B the head, and Cthe threaded shank. D is the slot in thehead, and by means of which the driver forces the screw home.

The countersunk head B, where it joins the body A, is rounded, as'showiiby the letter a. This prevents the formation of an obtuse angle orfillet at a, as would be the case if the straight lines of thecountersunk head and body intersected, as is the case in all woodscrewsof ordinary construction. A line drawn from the apex of this angle tothe apex of the angle in the bottom of the slot in the head will showthe weakest point in all the ordinary forms of wood-screws, and this isthe point where the screw proves, faulty in use, whereby the heads ofthe screws are frequently twisted off while being driven home.difliculties and objections I completely overcome by rounding the headat a, so as to supply more metal and prevent the formation of an obtuseangle, as in the ordinary form of screw.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is

The improved wood-screw, having the mentering angle formed by thejunction of the head with the body re-enforced, in the manner and forthe purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ISRAEL F. BROWN.

\Vitnesses:

HIRAM W. HUBBARD, EDW'D. '1. BROWN.

These

